What is the minimum balance required to keep the Zerodha account active?

There is no minimum balance required to keep the Zerodha account active. The trading account will be considered inactive or dormant if there is no trading activity for 12 consecutive months. See, Why did Zerodha send an email stating the account is inactive? The demat account, however, remains active indefinitely.

Did you know? An Account Maintenance Charge (AMC) of ₹300 + 18% GST per year is applicable on the demat. This is deducted from the Zerodha account balance every quarter from when the account was opened. See, What is Account Maintenance Charge (AMC)?